Can a kitten die from stress?

I've had a six weeks old kitten. I gave him food, I played with him. But I've found a two inches long kitten and he stole my heart. Now he thinks I'm his Momma. My older cat first swiped him but then he was laying there. I had time with him alone but he just died laying on the floor. I gave him food,... show more I've had a six weeks old kitten. I gave him food, I played with him. But I've found a two inches long kitten and he stole my heart. Now he thinks I'm his Momma. My older cat first swiped him but then he was laying there. I had time with him alone but he just died laying on the floor. I gave him food, love, etc. Can it be from jealous? I'm very sad.
Update: The older one died
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